PIAA is the number one brand in BMW Z4 aftermarket Daytime Running Light (aka DRL) Bulbs and for good reason. Their long history of producing the most reliable and best performing Daytime Running Light Bulbs in the market has been untouched by other competitors. These PIAA Xtreme White BMW Z4 Daytime Running Light Bulbs are using the newest technology available, and producing only the best Xtreme White coatings, these PIAA Xtreme White Bulbs are the best upgrade for your BMW Z4's Halogen Daytime Running Light system.
General:
Please make sure your lights have been off for at least 5-10 minutes before attempting to install. The glass gets extremely hot and could take some time to cool down.
Make sure your Z4 is off and parked on a level surface. For added safety, you could disconnect your positive battery terminal to make sure you do not damage your electrical system. This is also a good idea for newer model cars that throw a check engine light when you replace your headlight bulbs.
If any dirt or oil (including skin oil) gets on the glass of the bulb it could cause the bulb to overheat and blow prematurely. For this reason, please make sure to wear clean gloves and avoid touching the glass.
Is the price listed for a single Z4 bulb or is it for the pair?
All the PIAA bulbs we sell for your Z4 are sold by the pair. By paying the listed price, you get both bulbs. We do not have the bulbs packaged for individual sale.
How long will these PIAA bulbs last in my BMW Z4?
Generally speaking, if the bulbs are installed properly without leaving any dirt or oil on the surface, you could expect them to last 1-2 years. If you have any blowouts within the first couple of months, please let us know and we will be happy to replace them for you.
Do you carry BLUE headlight or fog light bulbs for my BMW Z4?
There are only a few companies that produce truly BLUE light bulbs (not super white with a blue tint, but actually royal blue). We do not carry these types of bulbs as the coating is usually very dark resulting in a very dim beam, making them a safety hazard.
Will these bulbs burn the wire harnesses on my BMW Z4?
Your Z4's stock wire harness is not designed to withstand continuous extended usage. For that reason, we offer Nokya Replacement Harnesses to ensure long term proper lighting on your Z4. They are also a far cheaper alternative to buying Z4 factory harnesses which lack the heat capacity of the Nokya Z4 harnesses.
Are these bulbs brighter than my BMW Z4's stock Headlight / Foglight bulbs?
No. Contrary to popular belief, aftermarket bulbs add color to your high beams / low beams / fog lights by adding a tint to the glass. This tint results in a nicer beam, but blocks out a small amount of light, resulting in a slightly dimmer beam than your stock clear Z4 bulb would have. The color comes at the price of a LITTLE bit of brightness, but most people do not notice the difference.
Why Should I Buy Aftermarket Bulbs for My BMW Z4's Headlights / Fog lights?
First off, the stock bulbs on your Z4 are going to wear out eventually. Replacing your bulbs with aftermarket headlight bulbs (or fog light bulbs) and keeping your OEM headlight bulbs for spares can be a good way to make sure you are always driving safe and minimize your chances of getting a time wasting fix-it ticket.
Also, changing your headlight bulbs can be an inexpensive, quick, and easy way to give your Z4 a nice personalized touch that unlike many upgrades, you can actually SEE while driving.
